Publication Date:
2017-04-04
Description:
This study investigates the engineering applicability of two conceptually
different finite-fault simulation techniques. We focus our attention on two important
aspects: first to quantify the capability of the methods to reproduce the observed
ground-motion parameters (peaks and integral quantities); second to quantify the dependence
of the strong-motion parameters on the variability in the large-scale kinematic
definition of the source (i.e., position of the nucleation point, value of the
rupture velocity, and distribution of the final slip on the fault).
We applied an approximated simulation technique, the deterministic-stochastic
method and a broadband technique, the hybrid-integral-composite method, to model
the 1984 Mw 5.7 Gubbio, central Italy, earthquake, at five accelerometric stations. We
first optimize the position of the nucleation point and the value of the rupture velocity
for three different final slip distributions on the fault by minimizing an error function
in terms of acceleration response spectra in the frequency band from 1 to 9 Hz. We
found that the best model is given by a rupture propagating at about 2:65 km=sec from
a hypocenter located approximately at the center of the fault. In the second part of the
article we calculate more than 2400 scenarios varying the kinematic source parameters.
At the five sites we compute the residuals distributions for the various strongmotion
parameters and show that their standard deviations depend on the source
parameterization adopted by the two techniques. Furthermore, we show that Arias
Intensity (AI) and significant duration are characterized by the largest and smallest
standard deviation, respectively. Housner Intensity is better modeled and less affected
by uncertainties in the source kinematic parameters than AI. The fact that the uncertainties
in the kinematic model affects the variability of different ground-motion parameters
in different ways has to be taken into account when performing hazard
assessment and earthquake engineering studies for future events.
Description:
Published
Description:
647-663
Description:
4.1. Metodologie sismologiche per l'ingegneria sismica
Description:
JCR Journal
Description:
reserved
Keywords:
ground-motion simulation
;
Gubbio 1984
;
ground-motion variability
;
04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
;
04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
;
04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
